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Relative Preservation of Triceps Over Biceps Strength in Upper Limb-Onset

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Relative Preservation of Triceps Over Biceps Strength in Upper Limb-Onset Neurodegeneration J Neurol Neurosurg Psychiatry: first published as 10.1136/jnnp-2018-319894 on 7 March 2019. Downloaded from RESEARCH PAPER Relative preservation of triceps over biceps strength in upper limb-onset ALS: the ‘split elbow’ Roaya Khalaf, 1 Sarah Martin,1 Cathy Ellis,2 Rachel Burman,2 Jemeen Sreedharan,1,2 Christopher Shaw,1,2 P Nigel Leigh,3 Martin R Turner, 4 Ammar Al-Chalabi 1,2 1Department of Basic and ABSTRACT preferential wasting and weakness of the thenar Clinical Neuroscience, Maurice Objective Amyotrophic lateral sclerosis (ALS) is muscles, with relative sparing of the hypothenar Wohl Clinical Neuroscience 2 Institute, King’s College London, a neurodegenerative disease of the motor system. muscles. More specifically, the sign is demon- London, UK The split hand sign in ALS refers to observed strated by dominant wasting of the abductor pollicis 2Department of Neurology, preferential weakness of the lateral hand muscles, brevis and the first dorsal interosseous on the lateral King’s College Hospital, London, which is unexplained. One possibility is larger cortical aspect of the hand, with sparing of the abductor UK representation of the lateral hand compared with the 3Department of Neuroscience, digiti minimi on the medial aspect, resulting in the Brighton and Sussex Medical medial. Biceps strength is usually preserved relative to split phenomenon.3 4 This pattern of involvement School, Sussex, UK triceps in neurological conditions, but biceps has a larger 4 is surprising, since isolated median nerve damage Nuffield Department of cortical representation and might be expected to show would not affect the first dorsal interosseous, ulnar Clinical Neurosciences, Oxford preferential weakness in ALS. University, Oxford, UK nerve damage would not affect the thenar eminence Methods Using the South-East England Register yet should involve abductor digiti minimi, and for Amyotrophic Lateral Sclerosis, we performed a Correspondence to root pathology would cause wasting of the thenar, retrospective longitudinal cohort study and extracted Professor Ammar Al-Chalabi, hypothenar and interosseous muscles. Thus, the the modified Medical ResearchC ouncil (MRC) muscle Maurice Wohl Clinical pattern cannot be explained by a lesion of the ulnar Neuroscience Institute, London strength score for biceps and triceps in patients with a nerve, median nerve or root. One explanation for SE5 9RX, UK; ammar. al- diagnosis of upper limb-onset ALS in the 19-year period chalabi@ kcl. ac. uk this phenomenon is that it reflects cerebral somato- 1996–2015. A Wilcoxon signed-rank test was used to topic hand representation, which is larger for the Received 27 October 2018 assess the relative strength of the muscles within the copyright. lateral hand for primates, in line with the evolution Revised 11 January 2019 total sum of the upper limbs involved in the study. 5 6 Accepted 7 February 2019 Results There were 659 people with upper limb onset of fine motor control. The split hand would then Published Online First 7 March of weakness. In 215 there were insufficient data to reflect a greater vulnerability correlated to the size 2019 perform the analysis, and a further 33 were excluded of the cortical map, supporting a broader concept for other reasons, leaving 411 for analysis. Biceps of a corticofugal mode of neurodegeneration in 7 8 was stronger than triceps in 87 limbs, and triceps was ALS. stronger than biceps in 258 limbs, with no difference A similar phenomenon exists at the level of the seen in the remaining 477. Triceps strength scores (mean lower limbs in patients with ALS, characterised rank=186.1) were higher than ipsilateral biceps strength by preferential wasting of the ankle plantar flexor scores (mean rank=134.2), Z=−10.1, p<0.001 (two- muscles compared with the dorsiflexors, resulting tailed). in a ‘split leg’ pattern.9 Although the ankle dorsi- http://jnnp.bmj.com/ Conclusion Triceps strength is relatively preserved flexors receive a greater density of corticomoto- compared with biceps in ALS. This is consistent with a neuronal projections than the plantar flexors, the broadly corticofugal hypothesis of selective vulnerability, nature of these projections with inhibitory cortical in which susceptibility might be associated with larger modulation being greater in the latter may help cortical representation. elucidate the pathogenesis in ALS in keeping with the hypothesis of altered inhibitory interneuronal on September 24, 2021 by guest. Protected function.10 A so-called pyramidal distribution of weakness INTRODUCTION is associated with lesions of the motor pathway Amyotrophic lateral sclerosis (ALS) is a neurode- anywhere from the cortex to the neuromuscular generative syndrome of the upper and lower motor junction, whereby flexors dominate extensors ► http:// dx. doi. org/ 10.1136/ neurons (and their wider cortical networks) char- in the upper limbs, and vice versa in the lower jnnp- 2019- 320534 acterised by relentlessly progressive skeletal muscle paralysis that ultimately leads to respiratory failure limbs. The elbow exhibits a degree of physio- and death.1 The site of onset of clinical symptoms logical flexion at rest, which is readily appreci- and their spread in ALS are non-random, but within ated through the exaggeration that follows the © Author(s) (or their maturation of a contralateral hemispheric stroke. employer(s)) 2019. Re-use a strikingly heterogeneous clinical syndrome that permitted under CC BY. is currently unified by the postmortem identifica- However, the cortical representation of biceps is 11 Published by BMJ. tion of neuronal and glial cytoplasmic inclusions greater than that of triceps. For ALS, therefore, in keeping with the split hand and the split leg, one To cite: Khalaf R, Martin S, of Trans-Activating Response (TAR) DNA-Binding Ellis C, et al. J Neurol Protein-43 (TDP-43). would expect biceps brachii to become preferen- Neurosurg Psychiatry A well-recognised clinical phenomenon in ALS tially involved reflecting its larger cortical repre- 2019;90:730–733. is the split hand sign, broadly characterised as sentation. We therefore tested this hypothesis by 730 Khalaf R, et al. J Neurol Neurosurg Psychiatry 2019;90:730–733. doi:10.1136/jnnp-2018-319894 Neurodegeneration J Neurol Neurosurg Psychiatry: first published as 10.1136/jnnp-2018-319894 on 7 March 2019. Downloaded from examining the relative strength of biceps and triceps muscles in people with ALS. METHODS Patient data Data were gathered from the South-East England Register for Amyotrophic Lateral Sclerosis (SEALS). This population-based register was established in 1997 and captures every person with ALS within a defined geographical region including Kent and South East London.12 To ensure involvement of the upper limbs, we selected all patients with upper limb-onset ALS and used Medical Research Council (MRC) motor strength scores for elbow flexion with the arm fully supinated (biceps) and elbow extension (triceps) recorded at the first visit to the tertiary referral clinic. The MRC system grades muscle strength as 0 (no movement at all), 1 (a flicker of movement), 2 (movement of the limb, but not able to lift its own weight), 3 (limb able to lift its own weight but not against resistance), 4 (reduced power against resistance) and 5 (full power). Grade 4 is further subdivided into 4− (barely able to resist), 4 (weak) and 4+ (only a little weak- ness). We noted handedness and converted the modified MRC score given for each muscle to a scaled score of 0–7; MRC scores Figure 1 Flow chart illustrating the selection of eligible patients for of 0, 1, 2, 3, 4−, 4, 4+ and 5 were mapped to the scores 0, 1, 2, the study. ALS, amyotrophic lateral sclerosis; MND, motor neuron disease; 3, 4, 5, 6 and 7, respectively. SEALS, South-East England Register for Amyotrophic Lateral Sclerosis. Statistical analysis people previously or currently on riluzole. Eighty-five per cent As MRC scores are not normally distributed, the Wilcoxon were right-handed, 8% left-handed and 2% ambidextrous, with signed-rank test was used to compare biceps power with triceps 7% missing handedness data. power in the same limb. Each limb was considered independently Biceps was stronger than triceps in 87 limbs, triceps stronger and not paired within the same individual. A sensitivity analysis than biceps in 258 limbs, and 477 limbs had equal scores. Overall, copyright. was performed by excluding limbs in which both muscles had triceps was stronger than biceps (triceps mean rank 186.1, biceps full power. mean rank 134.2; Z −10.1, p=8.5×10−24 [two-tailed]). The The binomial test of proportions was used to test whether median triceps score was 6 (IQR 5–7) and the mean was 5.69 differential strength patterns in one limb affected the probability (SD 1.5, 95% CI 5.59 to 5.79), while the median biceps score of a similar observation in the other limb, and to test the degree was 6 (IQR 4–7) and the mean was 5.27 (SD 1.83, 95% CI 5.13 of concordance between handedness and differential strength to 5.39). Frequencies for each score are shown in figure 2. patterns. Limbs were analysed independently of the patient. This The power function of the Wilcoxon signed-rank test is diffi- approach assumes that the pattern of weakness on one side 13 cult to define. Using the exact variance approach, there is 80% is independent of the pattern of weakness on the other in the power to detect a difference of 10% between biceps and triceps same person. We therefore tested this assumption. There were http://jnnp.bmj.com/ scores in a sample size of n=419, where n is the total number 88 people with concordant findings of stronger triceps in both of upper limbs. limbs, and 82 with discordant findings in which only one limb Data were entered into a spreadsheet, and calculations were showed the stronger triceps pattern.
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